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                        HTML
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                        HTML标签
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                            <b>2.</b>
                        
                        CSS
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                            <b>2.1.</b>
                        
                        字体属性
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                        文本属性
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                            <b>2.3.</b>
                        
                        背景属性
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                            <b>2.4.</b>
                        
                        盒子box
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                            <b>2.5.</b>
                        
                        浮动float
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                            <b>2.6.</b>
                        
                        定位position
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                            <b>2.7.</b>
                        
                        变形transform
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                            <b>2.8.</b>
                        
                        过渡transition
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                            <b>2.9.</b>
                        
                        阴影shadow
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                            <b>2.10.</b>
                        
                        选择器
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                            <b>2.11.</b>
                        
                        弹性盒子flex
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                            <b>2.12.</b>
                        
                        动画
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                            <b>2.13.</b>
                        
                        拓展内容
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                            <b>3.</b>
                        
                        JS
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                            <b>3.1.</b>
                        
                        if语句
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                            <b>3.2.</b>
                        
                        数据类型的转换
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                            <b>3.3.</b>
                        
                        数值类型Number
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                        字符串String
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                            <b>3.5.</b>
                        
                        数组Array
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                            <b>3.6.</b>
                        
                        数组的遍历
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                            <b>3.7.</b>
                        
                        filter过滤
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                            <b>3.8.</b>
                        
                        function函数
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                            <b>3.9.</b>
                        
                        定时器
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                            <b>3.10.</b>
                        
                        JS常用事件
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                            <b>3.11.</b>
                        
                        作用域-作用域链
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                            <b>4.</b>
                        
                        响应式Bootstrap
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                            <b>5.</b>
                        
                        ajax
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                            <b>6.</b>
                        
                        swiper
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                            <b>7.</b>
                        
                        变量提升和函数提升
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                            <b>8.</b>
                        
                        浏览器的渲染问题
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                            <b>8.1.</b>
                        
                        回流和重绘
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                            <b>9.</b>
                        
                        小事件
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                            <b>10.</b>
                        
                        创建对象的模式
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                            <b>10.1.</b>
                        
                        工厂模式
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                            <b>10.2.</b>
                        
                        构造函数
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                            <b>10.3.</b>
                        
                        原型模式和混合模式
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                            <b>11.</b>
                        
                        原型链
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        <li class="chapter " data-level="12" data-path="md/12this/this.html">
            
                
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                            <b>12.</b>
                        
                        this
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                            <b>13.</b>
                        
                        事件代理/事件委托
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                            <b>14.</b>
                        
                        同步&amp;异步任务
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                            <b>15.</b>
                        
                        防抖&amp;节流
                    </a>
            
            
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                            <b>16.</b>
                        
                        ES6
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                            <b>16.1.</b>
                        
                        let/const
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                            <b>16.2.</b>
                        
                        解构赋值
                    </a>
            
            
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                            <b>16.3.</b>
                        
                        Promise
                    </a>
            
            
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        <li class="chapter " data-level="16.4" data-path="md/16ES6/async&amp;await.html">
            
                
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                            <b>16.4.</b>
                        
                        async&amp;await
                    </a>
            
            
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                            <b>16.5.</b>
                        
                        class
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                            <b>16.6.</b>
                        
                        module
                    </a>
            
            
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        <li class="chapter " data-level="16.7" data-path="md/16ES6/Set.html">
            
                
                    <a href="../../md/16ES6/Set.html">
                
                        <i class="fa fa-check"></i>
                        
                            <b>16.7.</b>
                        
                        Set
                    </a>
            
            
        </li>
    
        <li class="chapter " data-level="16.8" data-path="md/16ES6/Map.html">
            
                
                    <a href="../../md/16ES6/Map.html">
                
                        <i class="fa fa-check"></i>
                        
                            <b>16.8.</b>
                        
                        Map
                    </a>
            
            
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            </ul>
            
        </li>
    
        <li class="chapter " data-level="17" data-path="md/17garbageCollection/garbageCollection.html">
            
                
                    <a href="../../md/17garbageCollection/garbageCollection.html">
                
                        <i class="fa fa-check"></i>
                        
                            <b>17.</b>
                        
                        垃圾回收机制
                    </a>
            
            
        </li>
    
        <li class="chapter " data-level="18" data-path="md/18closure/closure.html">
            
                
                    <a href="../../md/18closure/closure.html">
                
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                            <b>18.</b>
                        
                        闭包
                    </a>
            
            
        </li>
    
        <li class="chapter " data-level="19" data-path="md/19Vue/vue.html">
            
                
                    <a href="../../md/19Vue/vue.html">
                
                        <i class="fa fa-check"></i>
                        
                            <b>19.</b>
                        
                        Vue
                    </a>
            
            
            <ul class="articles">
                
    
        <li class="chapter " data-level="19.1" data-path="md/19Vue/模板语法.html">
            
                
                    <a href="../../md/19Vue/模板语法.html">
                
                        <i class="fa fa-check"></i>
                        
                            <b>19.1.</b>
                        
                        模板语法
                    </a>
            
            
        </li>
    
        <li class="chapter " data-level="19.2" data-path="md/19Vue/条件渲染.html">
            
                
                    <a href="../../md/19Vue/条件渲染.html">
                
                        <i class="fa fa-check"></i>
                        
                            <b>19.2.</b>
                        
                        条件渲染
                    </a>
            
            
        </li>
    
        <li class="chapter " data-level="19.3" data-path="md/19Vue/列表渲染.html">
            
                
                    <a href="../../md/19Vue/列表渲染.html">
                
                        <i class="fa fa-check"></i>
                        
                            <b>19.3.</b>
                        
                        列表渲染
                    </a>
            
            
        </li>
    
        <li class="chapter " data-level="19.4" data-path="md/19Vue/class&amp;style.html">
            
                
                    <a href="../../md/19Vue/class&amp;style.html">
                
                        <i class="fa fa-check"></i>
                        
                            <b>19.4.</b>
                        
                        class&amp;style
                    </a>
            
            
        </li>
    
        <li class="chapter " data-level="19.5" data-path="md/19Vue/v-model.html">
            
                
                    <a href="../../md/19Vue/v-model.html">
                
                        <i class="fa fa-check"></i>
                        
                            <b>19.5.</b>
                        
                        v-model
                    </a>
            
            
        </li>
    
        <li class="chapter " data-level="19.6" data-path="md/19Vue/computed.html">
            
                
                    <a href="../../md/19Vue/computed.html">
                
                        <i class="fa fa-check"></i>
                        
                            <b>19.6.</b>
                        
                        计算属性
                    </a>
            
            
        </li>
    
        <li class="chapter " data-level="19.7" data-path="md/19Vue/watch侦听.html">
            
                
                    <a href="../../md/19Vue/watch侦听.html">
                
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                            <b>19.7.</b>
                        
                        watch侦听
                    </a>
            
            
        </li>
    
        <li class="chapter " data-level="19.8" data-path="md/19Vue/filter.html">
            
                
                    <a href="../../md/19Vue/filter.html">
                
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                            <b>19.8.</b>
                        
                        过滤器
                    </a>
            
            
        </li>
    
        <li class="chapter " data-level="19.9" data-path="md/19Vue/组件.html">
            
                
                    <a href="../../md/19Vue/组件.html">
                
                        <i class="fa fa-check"></i>
                        
                            <b>19.9.</b>
                        
                        局部&amp;全局组件
                    </a>
            
            
        </li>
    
        <li class="chapter " data-level="19.10" data-path="md/19Vue/通讯&amp;传递信息.html">
            
                
                    <a href="../../md/19Vue/通讯&amp;传递信息.html">
                
                        <i class="fa fa-check"></i>
                        
                            <b>19.10.</b>
                        
                        通讯&amp;传递信息
                    </a>
            
            
        </li>
    
        <li class="chapter " data-level="19.11" data-path="md/19Vue/动态组件&amp;keepAlive.html">
            
                
                    <a href="../../md/19Vue/动态组件&amp;keepAlive.html">
                
                        <i class="fa fa-check"></i>
                        
                            <b>19.11.</b>
                        
                        动态组件&amp;keepAlive
                    </a>
            
            
        </li>
    
        <li class="chapter " data-level="19.12" data-path="md/19Vue/插槽slot.html">
            
                
                    <a href="../../md/19Vue/插槽slot.html">
                
                        <i class="fa fa-check"></i>
                        
                            <b>19.12.</b>
                        
                        插槽slot
                    </a>
            
            
        </li>
    
        <li class="chapter " data-level="19.13" data-path="md/19Vue/过渡和动画.html">
            
                
                    <a href="../../md/19Vue/过渡和动画.html">
                
                        <i class="fa fa-check"></i>
                        
                            <b>19.13.</b>
                        
                        过渡和动画
                    </a>
            
            
        </li>
    
        <li class="chapter " data-level="19.14" data-path="md/19Vue/生命周期.html">
            
                
                    <a href="../../md/19Vue/生命周期.html">
                
                        <i class="fa fa-check"></i>
                        
                            <b>19.14.</b>
                        
                        生命周期
                    </a>
            
            
        </li>
    

            </ul>
            
        </li>
    
        <li class="chapter " data-level="20" data-path="md/20vue-route/vue路由.html">
            
                
                    <a href="../../md/20vue-route/vue路由.html">
                
                        <i class="fa fa-check"></i>
                        
                            <b>20.</b>
                        
                        Vue路由router
                    </a>
            
            
        </li>
    
        <li class="chapter " data-level="21" data-path="md/Interview/Interview.html">
            
                
                    <a href="../../md/Interview/Interview.html">
                
                        <i class="fa fa-check"></i>
                        
                            <b>21.</b>
                        
                        JS面试题
                    </a>
            
            
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                        <h1 id="&#x5E94;&#x7528;&#x62D3;&#x5C55;">&#x5E94;&#x7528;&#x62D3;&#x5C55;</h1>
<h4 id="&#x7F51;&#x9875;&#x5E03;&#x5C40;&#x7684;&#x603B;&#x7ED3;">&#x7F51;&#x9875;&#x5E03;&#x5C40;&#x7684;&#x603B;&#x7ED3;</h4>
<ul>
<li>&#x4E00;&#x4E2A;&#x5B8C;&#x6574;&#x7684;&#x7F51;&#x9875;&#xFF0C;&#x662F;&#x7531;&#x6807;&#x51C6;&#x6D41;&#xFF0C;&#x6D6E;&#x52A8;&#xFF0C;&#x5B9A;&#x4F4D;&#x914D;&#x5408;&#x4E00;&#x8D77;&#x5E03;&#x5C40;&#x7684;&#x6BCF;&#x4E2A;&#x90FD;&#x6709;&#x81EA;&#x5DF1;&#x7684;&#x7528;&#x6CD5;</li>
<li>1.&#x6807;&#x51C6;&#x6D41;
  &#x53EF;&#x4EE5;&#x8BA9;&#x76D2;&#x5B50;&#x4E0A;&#x4E0B;&#x6216;&#x8005;&#x5DE6;&#x53F3;&#xFF0C;&#x7528;&#x5757;&#x7EA7;&#x76D2;&#x5B50; &#x6807;&#x51C6;&#x6D41;&#x5E03;&#x5C40;</li>
<li>2.&#x6D6E;&#x52A8;
  &#x8BA9;&#x591A;&#x4E2A;&#x5757;&#x7EA7;&#x5143;&#x7D20;&#x5E76;&#x5217;&#x4E00;&#x884C;&#x6216;&#x8005;&#x8FDE;&#x6BB5;&#x5BF9;&#x9F50;</li>
<li>3.&#x5B9A;&#x4F4D;
  &#x6700;&#x5927;&#x7684;&#x7279;&#x70B9;&#x5C31;&#x662F;&#x5B83;&#x7684;&#x5C42;&#x53E0;&#x6982;&#x5FF5;
  &#x8BA9;&#x5143;&#x7D20;&#x81EA;&#x7531;&#x7684;&#x5728;&#x67D0;&#x4E2A;&#x76D2;&#x5B50;&#x4E2D;&#x79FB;&#x52A8;</li>
</ul>
<h4 id="0px--rem--em&#x7684;&#x533A;&#x522B;">0px  rem  em&#x7684;&#x533A;&#x522B;</h4>
<ul>
<li>px&#xFF1A;Pixel&#xFF08;&#x50CF;&#x7D20;&#xFF09;&#x662F;&#x53EF;&#x4EE5;&#x5728;&#x6570;&#x5B57;&#x663E;&#x793A;&#x8BBE;&#x5907;&#x4E0A;&#x663E;&#x793A;&#x548C;&#x8868;&#x793A;&#x7684;&#x6570;&#x5B57;&#x56FE;&#x50CF;&#x6216;&#x56FE;&#x5F62;&#x7684;&#x6700;&#x5C0F;&#x5355;&#x4F4D;&#x3002;&#x50CF;&#x7D20;&#x662F;&#x6570;&#x5B57;&#x56FE;&#x5F62;&#x4E2D;&#x7684;&#x57FA;&#x672C;&#x903B;&#x8F91;&#x5355;&#x5143;&#xFF0C;&#x50CF;&#x7D20;&#x4E5F;&#x79F0;&#x4E3A;&#x56FE;&#x50CF;&#x5143;&#x7D20;&#x3002;</li>
<li>em&#xFF1A;em&#x5355;&#x4F4D;&#x540D;&#x79F0;&#x4E3A;&#x76F8;&#x5BF9;&#x957F;&#x5EA6;&#x5355;&#x4F4D;&#x3002;&#x76F8;&#x5BF9;&#x4E8E;&#x5F53;&#x524D;&#x5BF9;&#x8C61;&#x5185;&#x6587;&#x672C;&#x7684;&#x5B57;&#x4F53;&#x5C3A;&#x5BF8;&#x3002;</li>
<li>rem&#xFF1A;&#x4E00;&#x4E2A;&#x76F8;&#x5BF9;&#x5B57;&#x4F53;&#x7684;&#x5355;&#x4F4D;&#xFF0C;&#x4F46;&#x662F;&#x5B83;&#x662F;&#x76F8;&#x5BF9;html&#x7684;&#xFF0C;&#x6BD4;&#x5982;&#x8BBE;&#x7F6E;html&#x7684;font-size: 14px; &#x90A3;&#x4E48;1rem = 14px</li>
</ul>
<h4 id="&#x5143;&#x7D20;&#x6C34;&#x5E73;&#x5C45;&#x4E2D;">&#x5143;&#x7D20;&#x6C34;&#x5E73;&#x5C45;&#x4E2D;</h4>
<ul>
<li>&#x6587;&#x5B57;&#x548C;&#x56FE;&#x7247;&#xFF1A;text-align&#xFF1A;center
  &#x5757;&#x7EA7;&#x5143;&#x7D20;&#x7684;&#x5C45;&#x4E2D;
  &#x77E5;&#x9053;&#x5BBD;&#x5EA6;
  margin&#xFF1A;0 auto
  &#x4E0D;&#x77E5;&#x9053;&#x5BBD;&#x5EA6;<ul>
<li>1.display&#xFF1A;inline-block&#xFF1B;
text-align:center;</li>
<li>2.&#x5B9A;&#x4F4D;&#xFF1A;{&#x5B50;&#x7EDD;&#x7236;&#x76F8;}  left&#xFF1A;50%  transform:translateX(-50%); </li>
<li>3.&#x5F39;&#x6027;&#x76D2;&#x5B50;flex 
&#x4EE3;&#x7801;&#xFF1A;display:flex;  justify-content:center;</li>
</ul>
</li>
</ul>
<h4 id="&#x5143;&#x7D20;&#x5782;&#x76F4;&#x5C45;&#x4E2D;">&#x5143;&#x7D20;&#x5782;&#x76F4;&#x5C45;&#x4E2D;</h4>
<ul>
<li>&#x6587;&#x5B57;&#x548C;&#x56FE;&#x7247;&#xFF1A;line-height:&#x548C;&#x76D2;&#x5B50;&#x540C;&#x9AD8;&#xFF1B;</li>
<li>&#x5757;&#x7EA7;&#x5143;&#x7D20;&#x7684;&#x5782;&#x76F4;&#x5C45;&#x4E2D;&#xFF1A;
  &#x77E5;&#x9053;&#x5BBD;&#x5EA6;&#xFF1A;
  display:inline-block; margin-top:xxx
  &#x4E0D;&#x77E5;&#x9053;&#x5BBD;&#x5EA6;<ul>
<li>1.&#x5B9A;&#x4F4D;{&#x5B50;&#x7EDD;&#x7236;&#x76F8;} top&#xFF1A;50%  transform&#xFF1A;translateY&#xFF08;-50%&#xFF09;
&#x6216;&#x8005; top bottom left right&#xFF1A;0&#xFF1B;  margin&#xFF1A;auto auto&#xFF1B;</li>
<li>2.&#x5F39;&#x6027;&#x76D2;&#x5B50; flex   &#x4EE3;&#x7801; display:flex; justify-content:center;</li>
</ul>
</li>
</ul>
<h4 id="link&#x548C;import&#x7684;&#x533A;&#x522B;">link&#x548C;@import&#x7684;&#x533A;&#x522B;</h4>
<ul>
<li>1.&#x8BED;&#x6CD5;&#x7ED3;&#x6784;&#x7684;&#x533A;&#x522B;
  link&#x901A;&#x8FC7;html&#x6807;&#x7B7E;&#xFF0C;&#x53EA;&#x80FD;&#x653E;&#x5728;&#x6E90;&#x4EE3;&#x7801;&#x4E2D;&#x4F7F;&#x7528;
  @import&#x770B;&#x4F5C;CSS&#x6837;&#x5F0F;&#x53BB;&#x6620;&#x5165;</li>
<li>2.&#x517C;&#x5BB9;&#x6027;
  @import css2.1&#x624D;&#x6709;&#x7684;
  css3
  link css3</li>
<li>3.link&#x5728;&#x7F51;&#x9875;&#x8FD0;&#x884C;&#x540C;&#x65F6;&#x4E00;&#x8D77;&#x8FD0;&#x884C;
  @import&#x662F;&#x9875;&#x9762;&#x90FD;&#x52A0;&#x8F7D;&#x5B8C;&#x518D;&#x542F;&#x52A8;&#xFF0C;&#x5982;&#x679C;&#x7F51;&#x901F;&#x8FC7;&#x6162;&#xFF0C;&#x9875;&#x9762;&#x53EF;&#x80FD;&#x95EA;&#x52A8;</li>
</ul>
<h4 id="git-&#x5206;&#x5E03;&#x5F0F;-&#x7248;&#x672C;&#x7BA1;&#x7406;&#x7CFB;&#x7EDF;">git &#x5206;&#x5E03;&#x5F0F; &#x7248;&#x672C;&#x7BA1;&#x7406;&#x7CFB;&#x7EDF;</h4>
<ul>
<li>1.&#x4E0A;&#x4F20;GIT</li>
<li><p>2.&#x521B;&#x5EFA;&#x4E00;&#x4E2A;&#x6587;&#x4EF6;&#x5939;&#xFF0C;&#x6587;&#x4EF6;&#x8DEF;&#x5F84;&#x8F93;&#x5165;cmd
  &#x7136;&#x540E;&#x8F93;&#x5165; git clone http&#x5730;&#x5740;&#xFF08;&#x5728;gitee&#x91CC;&#x9762; &#xFF09;</p>
</li>
<li><p>&#x4E0A;&#x4F20;git&#x56DB;&#x6B65;&#x8D70;&#xFF1A;</p>
<ul>
<li>1.git add ./</li>
<li>2.git commit -m &quot;&#x540D;&#x79F0;&quot;</li>
<li>3.git pull &#x89E3;&#x51B3;&#x51B2;&#x7A81;</li>
<li>4.git push &#x4E0A;&#x4F20;</li>
</ul>
</li>
</ul>
<h4 id="&#x5143;&#x7D20;&#x7684;&#x663E;&#x793A;&#x548C;&#x9690;&#x85CF;">&#x5143;&#x7D20;&#x7684;&#x663E;&#x793A;&#x548C;&#x9690;&#x85CF;</h4>
<ul>
<li>&#x4E00;&#x3001;display<ul>
<li>block   inline-block   inline</li>
<li>&#x5143;&#x7D20;&#x7684;&#x663E;&#x793A;   block</li>
<li>&#x5143;&#x7D20;&#x7684;&#x9690;&#x85CF;   none</li>
<li><strong>&#x8BBE;&#x7F6E;&#x4E3A;none&#x7684;&#x65F6;&#x5019;&#xFF0C;&#x5143;&#x7D20;&#x9690;&#x85CF;&#xFF0C;&#x4E0D;&#x5360;&#x6709;&#x4F4D;&#x7F6E;&#x4E86;&#xFF08;&#x4EE5;&#x540E;JS&#x4F1A;&#x5927;&#x91CF;&#x4F7F;&#x7528;</strong></li>
</ul>
</li>
<li>&#x4E8C;&#x3001;visibility &#x7684;&#x663E;&#x793A;&#x548C;&#x9690;&#x85CF;<ul>
<li>hidden  &#x5143;&#x7D20;&#x9690;&#x85CF;&#xFF0C;<strong>&#x4F1A;&#x5360;&#x6709;&#x4F4D;&#x7F6E;</strong></li>
<li>visible &#x53EF;&#x89C1;</li>
</ul>
</li>
<li>&#x4E09;&#x3001;overflow<ul>
<li><strong>&#x5982;&#x679C;&#x5143;&#x7D20;&#x6709;&#x5B9A;&#x4F4D;&#xFF0C;&#x5C3D;&#x91CF;&#x4E0D;&#x8981;&#x4F7F;&#x7528;overflow</strong></li>
<li>visible  &#x9ED8;&#x8BA4;&#x503C; &#x8D85;&#x51FA;&#x90E8;&#x5206;&#x53EF;&#x89C1;</li>
<li>hidden  &#x9690;&#x85CF;&#xFF0C;&#x8D85;&#x51FA;&#x90E8;&#x5206;&#x9690;&#x85CF;</li>
<li>scroll  &#x6DFB;&#x52A0;&#x6EDA;&#x52A8;&#x6761;&#xFF08;&#x4E00;&#x5B9A;&#x6709;&#x6EDA;&#x52A8;&#x6761;&#xFF09;  &#x8D85;&#x51FA;&#x90E8;&#x5206;&#x7528;&#x6EDA;&#x52A8;&#x6761;&#x663E;&#x793A;</li>
<li>auto   &#x6DFB;&#x52A0;&#x6EDA;&#x52A8;&#x6761; &#x6309;&#x9700;&#x663E;&#x793A;&#x6EDA;&#x52A8;&#x6761;&#xFF08;&#x5185;&#x5BB9;&#x4E0D;&#x8D85;&#x51FA;&#x5C31;&#x4E0D;&#x4F1A;&#x51FA;&#x73B0;&#x6EDA;&#x52A8;&#x6761;&#xFF09;</li>
</ul>
</li>
<li>&#x56DB;&#x3001;opacity &#x900F;&#x660E;</li>
</ul>
<h4 id="&#x79FB;&#x52A8;&#x7AEF;&#x5F00;&#x53D1;&#x70ED;&#x95E8;-&#x9700;&#x6C42;&#x91CF;&#x76F8;&#x5F53;&#x5927;">&#x79FB;&#x52A8;&#x7AEF;&#x5F00;&#x53D1;--&#x70ED;&#x95E8; &#x9700;&#x6C42;&#x91CF;&#x76F8;&#x5F53;&#x5927;</h4>
<ul>
<li>1.web&#x79FB;&#x52A8;&#x7AEF;
  &#x6253;&#x5305; &#x540C;&#x65F6;&#x751F;&#x6210; ios &#x5B89;&#x5353;</li>
<li>2.&#x6DF7;&#x5408;&#x5F0F;&#x5F00;&#x53D1;  hybird  &#x539F;&#x751F;app 
  ios  C++  C&#x8BED;&#x8A00;
  &#x5B89;&#x5353;  android  java</li>
<li>3.&#x5FAE;&#x4FE1;&#x5C0F;&#x7A0B;&#x5E8F;</li>
<li>&#x5206;&#x8FA8;&#x7387;<br>  &#x5C31;&#x662F;&#x624B;&#x673A;&#x5C4F;&#x5E55;&#x4E0A;&#x7684;&#x683C;&#x5B50;&#x4E2A;&#x6570;<br>  &#x7269;&#x7406;&#x50CF;&#x7D20;&#xFF08;&#x8BBE;&#x5907;&#x50CF;&#x7D20;&#xFF09;<br>  &#x4E00;&#x822C;&#x60C5;&#x51B5;&#x4E0B;&#x4E0D;&#x7528;&#x505A;&#x5F00;&#x53D1;<br>  css&#x50CF;&#x7D20;&#xFF08;&#x903B;&#x8F91;&#x50CF;&#x7D20;&#xFF09;</li>
<li>Retina&#x5C4F;
  dpr  &#x8BBE;&#x5907;&#x50CF;&#x7D20;&#x6BD4;=&#x8BBE;&#x5907;&#x50CF;&#x7D20;/css&#x50CF;&#x7D20;
  &#x6807;&#x6E05;&#x5C4F;&#x5E55; dpr 1 
  Retina&#x9AD8;&#x6E05;&#x5C4F;  dpr 2 
  1&#x4E2A;css&#x50CF;&#x7D20;  &#x7528;2*2&#x8BBE;&#x5907;&#x50CF;&#x7D20;
  px&#x6EE1;&#x8DB3;&#x4E0D;&#x4E86;&#x5E03;&#x5C40;
  rem  &#x6839;&#x636E;&#x6211;&#x4EEC;HTML&#x6839;&#x8282;&#x70B9;&#x7684;&#x5B57;&#x4F53;&#x5927;&#x5C0F;font-size   200  16px  12.5rem</li>
</ul>
<h4 id="sass-&#x5DE5;&#x5177;">Sass &#x5DE5;&#x5177;</h4>
<ul>
<li>1.&#x4E86;&#x89E3;Sass &#x5DE5;&#x5177;<br>  Sass&#x6700;&#x6210;&#x719F;&#xFF0C;&#x6700;&#x5E73;&#x7A33;&#xFF0C;&#x6700;&#x5F3A;&#x5927;&#xFF0C;&#x6700;&#x4E13;&#x4E1A;&#x7684;css&#x7684;&#x62D3;&#x5C55;&#x5DE5;&#x5177;<br>  css&#x62D3;&#x5C55;&#x5DE5;&#x5177;<br>  sass  less  stylus<br>  &#x5DE5;&#x5177;  &#x7F16;&#x8BD1;&#x73AF;&#x5883;    &#x8BED;&#x6CD5;   </li>
<li>2.sass&#x5DE5;&#x4F5C;&#x6D41;&#x7A0B;<br>  .sass  .scss&#x524D;&#x7F6E;&#x6587;&#x4EF6;  =&#x300B;&#x7F16;&#x8BD1; =&#x300B;css</li>
<li>3.sass&#x89E3;&#x51B3;&#x4EC0;&#x4E48;&#x95EE;&#x9898;<ul>
<li>a.&#x901A;&#x8FC7;&#x82B1;&#x62EC;&#x53F7;&#x7684;&#x65B9;&#x5F0F;&#x89E3;&#x51B3;&#x590D;&#x6742;&#x7684;css&#x7236;&#x5B50;&#x6837;&#x5F0F;&#x5D4C;&#x5957;&#x7684;&#x95EE;&#x9898;</li>
<li>b.&#x53D8;&#x91CF;&#x89C4;&#x5219;&#x901A;&#x8FC7;&#x53D8;&#x91CF;&#x63D0;&#x53D6;&#x516C;&#x5171;&#x53D8;&#x91CF;&#xFF0C;&#x51CF;&#x5C11;&#x4FEE;&#x6539;</li>
<li>c.&#x50CF;&#x9AD8;&#x7EA7;&#x8BED;&#x8A00;js&#x4E00;&#x6837;&#x7F16;&#x5199;&#x903B;&#x8F91;&#x6027;&#x7684;&#x4EE3;&#x7801;</li>
</ul>
</li>
<li>4.&#x73AF;&#x5883;&#x5B89;&#x88C5;</li>
<li>5.&#x600E;&#x4E48;&#x73A9;&#xFF0C;&#x57FA;&#x7840;&#x8BED;&#x6CD5;</li>
<li>6.&#x5B9E;&#x6218;</li>
<li>//&#x521B;&#x5EFA; scss scss/index.scss css/index.css
  //&#x8DEF;&#x5F84;&#x4E0D;&#x80FD;&#x6709;&#x4E2D;&#x6587;<br>  //&#x70ED;&#x66F4;&#x65B0; scss --watch scss/index.scss:css/index.css*</li>
</ul>
<h4 id="after&#x548C;after&#x7684;&#x533A;&#x522B;&#xFF1F;">:after&#x548C;::after&#x7684;&#x533A;&#x522B;&#xFF1F;</h4>
<ul>
<li>1.&#x8BED;&#x6CD5;&#x7684;&#x4E0D;&#x540C;</li>
<li>2.&#xFF1A;&#x4F2A;&#x7C7B;&#x672C;&#x8D28;&#x4E0A;&#x4E3A;&#x4E86;&#x4F60;&#x8865;&#x5E38;&#x89C4;&#x9009;&#x62E9;&#x5668;&#x7684;&#x4E0D;&#x8DB3;&#xFF0C;&#x4EE5;&#x4FBF;&#x83B7;&#x53D6;&#x66F4;&#x591A;&#x7684;&#x4FE1;&#x606F;</li>
<li>3.&#xFF1A;&#xFF1A;&#x4F2A;&#x5143;&#x7D20;&#x7684;&#x672C;&#x8D28;&#x662F;&#x521B;&#x5EFA;&#x4E00;&#x4E2A;&#x6709;&#x5185;&#x5BB9;&#x4F46;&#x662F;&#x865A;&#x62DF;&#x7684;&#x5BB9;&#x5668;</li>
<li>4.&#x53EF;&#x4EE5;&#x540C;&#x65F6;&#x4F7F;&#x7528;&#x591A;&#x4E2A;&#x4F2A;&#x7C7B;&#xFF0C;&#x800C;&#x53EA;&#x80FD;&#x4F7F;&#x7528;&#x4E00;&#x4E2A;&#x4F2A;&#x5143;&#x7D20;</li>
</ul>

                    
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